Jim, I can 100% understand why this would be the case where a chopper is used ahead of the transformer primary (e.g., typical SMPS) and the secondary is rectified and filtered. The faster rise time
Having worked as a past director for a utility company, I have developed a general dispute resolution and escalation process. Of course, the order of escalation is subject to the nature of the compla
There's nothing wrong with engaging elected officials into the dispute process but be forewarned that: (1) empty promises are often given to investigate and in my experience as an attorney, elected
Jim, I'm using SDR-IQ with my K3 and although WYFR is extremely strong from Okeechobee into Jacksonville, I see no evidence of splatter. In fact, the transmit bandwidth looks well controlled. My gue
You're confusing emissions with the certification requirement. Under Part 15.103(d), appliances are exempt from the certification requirement. Appliances are not exempt from the generation of harmfu
Kelly, You'll need to start documenting the interference. To the best of your ability and time, keep a log of the times the interference starts and stops -- even if its days in between. As has been s
Somewhat related, I just discovered more low-level switch-mode noise coming from my Netgear 16-port Ethernet router. I cracked open the case and discovered what I've recently been seeing elsewhere in
Chas, Your detection method closely mirrors my own. The key to quick detection as you have indicated is to have a highly directional HF loop antenna. With a loop, triangulating common switch-mode and
Forgot to add -- I especially like the tolerance value given by W1HIS in his loop diagram as +/- 0.0001 inch. Good one! Paul, W9AC _______________________________________________ RFI mailing list RFI
The issue for most of us is not limited to our neighbors, but our own home-grown noise sources. I agree with Jim. Parallel tuned feeders can be susceptible to nearby noise sources. The problem becom
I do. Two Jennings 75A @ 10KV vacuum relays form a knife switch at the antenna feed point in my outdoor, motorized ATU. When the shack ATU controller is powered on, the relays close. When I QRT, the
Joe, Jim, W8ZR recently went through this exercise and he's got quite an extensive system at his QTH in Santa Fe, NM. You may want to get his input concerning RFI abatement from the system's inverter
Keep in mind that it's not only the screen technology that causes RFI. Switch-mode power supplies will always be suspect. Some manufacturers like LG and Samsung seem to take switch-mode power supply
To capture the RF noise signature, a scope should not be the tool of choice. You'll want to investigate using a pan adapter on an IF port or an SDR receiver as a pan adapter. Capturing the noise sign
The larger issue is the continued proliferation of filterless SMPS devices. While plasma sales continue to decline, devices using either internal or external (e.g., wall wart) SMPS is increasing. Ad
I don't see a National RF product that covers 160m-80m. Their NLF-2 only covers up to 160m. The vast majority of my noise source show up on these two bands. I'm presently using a Palomar LA-1 with t
That's a good practice. I recently changed out all the outlet's in the dining room of a friend's home. Each receptacle contained a combination screw terminal with optional "spring-contact" for quick
I recently replaced Halogen under-counter kitchen lighting with Xenon types. The units purchased do not use switching technology and have better compatibility with a light dimmers. Purchased at Home
The question of "what is it?" is not completely irrelevant. Before the "just get out and find it phase," one really needs to know the noise pattern category. Time spent in localizing the noise sourc
Dave, Although this issue is still best handled diplomatically as neighbors, you may want to be armed with multiple FCC enforcement letters that address similar interference complaints between hams a